PSYC33H3 Lecture Notes - Lecture 6: Traumatic Brain Injury, Cerebral Circulation, Tinnitus
Document Summary
Lecture 6: concussion: detecting and treating the invisible injury . Concussion and mild traumatic brain injury are used interchangeably: slang: bell-ringer , seeing stars , dazed . Immediate and temporary alteration of mental functioning due to trauma. Do not need loss of consciousness: any loss of consciousness must be less than 30 minutes. Does not require a direct hit to the head (e. g. whiplash) Rarely detected using neuroimaging techniques (e. g. ct, mri) Many concussions involve both of these forces: Rotational: sudden rotation of the brain: white matter may be particularly vulnerable (most sensitive, prolonged recovery. Damage will depend on the speed: fast will cause damage to neuron axons and the micro tubules. Some of these axons will be destroyed while others can survive. There are both immediate and short-term effects (up to 15 days post-injury): increase in metabolic activity, reduced cerebral blood flow. Overall: the brain tries to compensate by using more resources while doing normal tasks.
